How to control amount in MIRO

Hi all,

Kindly advice on below problem

The user wants that system should issue warning message whenever MIRO Line item amount goes above or below 10 % of corrosponding PO line item amount.

I activated Tolerance key "PP" and set upper and lower limit to 10 %. Also I set system messages M8 083 and M8 085 to "Warning".

It works fine with Lower Limit.

But on exceeding upper tol. limit, system put payment block in invoice, which user do not want to happen. Hence is there any solution/ alternate way to do this?

Many thanks in advance,

Amit